[Samba] Speedup windows client [was] What is the maximum speed for download from a samba share

[L.P.H. van Belle]

As counter example. 
My slowest server, AMD E350 2 core, max 1.6Gz. 
On 1Gb lan, disk 2x 5400rpm software raid 1 + 1 ssd. 

Copy Speed 115Mb/s as in max 1Gb bandwith, from a win7 and win10 pc to the raid1.

File sizes. 
100Mb+ get max 115Mb/s 		to a 4MB blocksized partition.
1-10mb files ,max 90-115Mb/s 	 to a 1MB blocksized partition.
0.0-1mb files  ,max 60-100Mb/s to a 4k blocksized partition.

I get these speeds while im watching my kodi. ;-)  Samba 4.6.x on ubuntu 17.10 
One note here, i use kernel 4.16.1 from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D 
Thats mostly for kodi and the amd GPU driver, but i do notice bit better perfomance with these higher kernels.

Is the Lenovo Thinkpad T520 with Windows 7, connecting over Wifi? 
Because on wifi, even if i set my laptop 3 meters from the AP, i dont get max.
About 1/2 the speeds, if lucky 3/4 the above speeds. 
Test you wifi with inSSIDer, optimze the chanels. 
Gave me about +25% speed at home on the wifi.

> one of the  virtual machine is the samba VM connected via VPN
> Looking to the cpu usage of this VM ist nearly zero during downloads.
Did you tweak your MTU sizes? 
With things like : 
iptables -A PREROUTING --match policy --pol ipsec --dir in -i eth+ -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1361:1536 -j TCPMSS --set-mss 1360
Maybe disable Path MTU discovery to prevent packet fragmentation problems. Helps alo  (  net/ipv4/ip_no_pmtu_disc=1  ) 

Last, login on the proxymod monitor IRQ use, if you have extra cards in the server, you might have one the using a "shared IRQ" 
I make sure, if possible, that my NIC have there own irq set and not a shared one. 

And can you post your smb.conf ? That might help also. 


Greetz, 

Louis


> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Knut 
> Krüger via samba
> Verzonden: woensdag 25 april 2018 8:29
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] Speedup windows client [was] What is 
> the maximum speed for download from a samba share
> 
> Am 22.04.2018 um 04:30 schrieb L A Walsh via samba:
> > Knut Krüger via samba wrote:
> >>> Limiting the linux-server's max cpu-speed had
> >>> the most affect on performance:
> >>> (limited to 1.6GHz instead of 2.4GHz) (33% limitation)
> >> The server is equipped with an 6 core / 12 tread 3.6 GHz 
> CPU (Intel 
> >> Core i7-980x   and  a Raid 10 Disk array.
> >> The cpu is 90% idle (including webserver traffic and mailserver 
> >> traffic) during downloads.
> > ---
> >    In protocols before cifsV3, only 1 tcp connection was 
> allowed between
> > a user at workstation and a server.  So multi-cores make no difference.
> Ok this clarifies why two downloads are getting more bandwidth than 1
> >
> >    When you say "the cpu is 90% idle", you realize that means 10%
> > busy.  10% * 12 cores = 1.2 cores busy.  That may imply one
> > core is "pegged".  Though it sounds unlikely even with a 100Mb
> > network that your cpu is the problem.
> To clarify the setup
> The root server is the 6 core/12 tread machine.
> it is an stretch proxmox installation
> this machine is minimum 90% idle
> 
> one of the  virtual machine is the samba VM connected via VPN
> Looking to the cpu usage of this VM ist nearly zero during downloads.
> There is no difference wehter the VM gets 1 ore more cores or 
> changing 
> the CPU limit.  /CPU Limit us unlimited
> 
> doing some additional test, it seems that a part of the speed lag is 
> client depending.
> 
>     4 core client with Linux is about 25.000 Kbits
>     Lenovo Thinkpad T520 with Windows 7 is the worst client
>     (unfortunately the most important) with 750 kbits/sec  :-(
> 
> So as a first step (as it is really important)  i have to 
> speed up the 
> windows client.
> Any hints?
> 
> After that I will try to speedup the server.
> 
> Kind regards Knut
> >
> >    For my testing, I run my test script on cygwin and
> > "cd" to my home directory on the server (/h) where my
> > test "files" (character devices) are located (/h/zero and /h/null)
> >
> > From there I usually run it with "bin/iotest".  I'll attach
> > the bash script.  If you find it of any use, great! else, ignore it.
> > My linux-box has bash-4.4 on it and is currently using a 
> 4.14.0 kernel.
> >
> > Good luck...don't want to overwhelm, so I'll end here.
> >
> >
> >
> 
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